Journal
SYNTHETIC METALS
Volume 160, Issue 13-14, Pages 1397-1400Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2010.04.016
Keywords
Fluorene; Oligomers; Amplified spontaneous emission; Organic semiconductor; Distributed feedback
Funding
- EPSRC [EP/F059922/1, EP/F05999X/1]
- EPSRC [EP/E036244/1, EP/F059922/1, EP/F05999X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F059922/1, EP/F05999X/1, EP/E036244/1] Funding Source: researchfish
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We report amplified spontaneous emission (ASE) and optically pumped deep-blue-emitting distributed feedback (DFB) lasers based on a star-shaped oligofluorene truxene molecule. A low ASE threshold of 2.1 kW/cm(2) at 439 nm was achieved. The material exhibits a high net gain of 38 cm(-1) and also low optical loss coefficient of 3.5 cm(-1). Second-order DFB lasers show tuning of the emission wavelength from 422 to 473 nm, and a minimum threshold density of 515 W/cm(2). This is the broadest tuning range (51 nm) reported for organic deep-blue/blue lasing materials. (C) 2010 Elsevier B.V. All rights reserved.
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